forked from pjsier's block: Line Chart Transition
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July 19, 2018 18:25
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Line Chart Transition
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| license: mit |
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| month | value | |
|---|---|---|
| 08/2016 | 6 | |
| 09/2016 | 5 | |
| 10/2016 | 8 | |
| 11/2016 | 9 | |
| 12/2016 | 8 | |
| 01/2017 | 10 | |
| 02/2017 | 12 | |
| 03/2017 | 15 | |
| 04/2017 | 17 | |
| 05/2017 | 6 | |
| 06/2017 | 8 | |
| 07/2017 | 9 | |
| 08/2017 | 15 | |
| 09/2017 | 18 | |
| 10/2017 | 20 | |
| 11/2017 | 25 | |
| 12/2017 | 29 |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Line Chart Transition</title> | |
| <meta name="viewport" content="initial-scale=1.0, user-scalable=no" /> | |
| <meta charset='utf-8' /> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { | |
| font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; | |
| } | |
| #chart { | |
| max-width: 600px; | |
| max-height: 400px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="chart"></div> | |
| <script src="script.js"></script> | |
| <script> | |
| var lines = timelineChart(); | |
| function resize() { | |
| if (d3.select("#chart svg").empty()) { | |
| return; | |
| } | |
| lines.width(+d3.select("#chart").style("width").replace(/(px)/g, "")) | |
| .height(+d3.select("#chart").style("height").replace(/(px)/g, "")); | |
| d3.select("#chart").call(lines); | |
| } | |
| d3.csv("data.csv", function (data) { | |
| console.log(data); | |
| d3.select("#chart").datum(data).call(lines); | |
| d3.select(window).on('resize', resize); | |
| resize(); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| function timelineChart() { | |
| var margin = { top: 20, right: 20, bottom: 50, left: 50 }, | |
| width = 350, | |
| height = 350, | |
| parseTime = d3.timeParse("%m/%Y"), | |
| timeValue = function(d) { return parseTime(d.month); }, | |
| dataValue = function (d) { return +d.value; }, | |
| color = "steelblue"; | |
| // From https://bl.ocks.org/mbostock/5649592 | |
| function transition(path) { | |
| path.transition() | |
| .duration(2000) | |
| .attrTween("stroke-dasharray", tweenDash); | |
| } | |
| function tweenDash() { | |
| var l = this.getTotalLength(), | |
| i = d3.interpolateString("0," + l, l + "," + l); | |
| return function (t) { return i(t); }; | |
| } | |
| function chart(selection) { | |
| selection.each(function (data) { | |
| data = data.map(function (d, i) { | |
| return { time: timeValue(d), value: dataValue(d) }; | |
| }); | |
| var x = d3.scaleTime() | |
| .rangeRound([0, width - margin.left - margin.right]) | |
| .domain(d3.extent(data, function(d) { return d.time; })); | |
| var y = d3.scaleLinear() | |
| .rangeRound([height - margin.top - margin.bottom, 0]) | |
| .domain(d3.extent(data, function(d) { return d.value; })); | |
| var line = d3.line() | |
| .x(function(d) { return x(d.time); }) | |
| .y(function(d) { return y(d.value); }); | |
| var svg = d3.select(this).selectAll("svg").data([data]); | |
| var gEnter = svg.enter().append("svg").append("g"); | |
| gEnter.append("path") | |
| .datum(data) | |
| .attr("class", "data") | |
| .attr("fill", "none") | |
| .attr("stroke", "steelblue") | |
| .attr("stroke-linejoin", "round") | |
| .attr("stroke-linecap", "round") | |
| .attr("stroke-width", 4); | |
| gEnter.append("g").attr("class", "axis x"); | |
| gEnter.append("g").attr("class", "axis y") | |
| .append("text") | |
| .attr("fill", "#000") | |
| .attr("transform", "rotate(-90)") | |
| .attr("y", 6) | |
| .attr("dy", "0.71em") | |
| .attr("text-anchor", "end") | |
| .text("Data"); | |
| gEnter.append("path") | |
| .attr("class", "data"); | |
| var svg = selection.select("svg"); | |
| svg.attr('width', width).attr('height', height); | |
| var g = svg.select("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| g.select("g.axis.x") | |
| .attr("transform", "translate(0," + (height - margin.bottom) + ")") | |
| .call(d3.axisBottom(x).ticks(5)) | |
| .select(".domain") | |
| .remove(); | |
| g.select("g.axis.y") | |
| .attr("class", "axis y") | |
| .call(d3.axisLeft(y)); | |
| g.select("path.data") | |
| .datum(data) | |
| .attr("d", line) | |
| .call(transition); | |
| }); | |
| } | |
| chart.margin = function (_) { | |
| if (!arguments.length) return margin; | |
| margin = _; | |
| return chart; | |
| }; | |
| chart.width = function (_) { | |
| if (!arguments.length) return width; | |
| width = _; | |
| return chart; | |
| }; | |
| chart.height = function (_) { | |
| if (!arguments.length) return height; | |
| height = _; | |
| return chart; | |
| }; | |
| chart.parseTime = function (_) { | |
| if (!arguments.length) return parseTime; | |
| parseTime = _; | |
| return chart; | |
| }; | |
| chart.timeValue = function (_) { | |
| if (!arguments.length) return timeValue; | |
| timeValue = _; | |
| return chart; | |
| }; | |
| chart.dataValue = function (_) { | |
| if (!arguments.length) return dataValue; | |
| dataValue = _; | |
| return chart; | |
| }; | |
| return chart; | |
| } |
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